I show that it is possible to choose the eikonals for the lens groups of a zoom lens such that extended objects at infinity are imaged perfectly, without any aberrations, at all zoom settings.
© 2001 Optical Society of America
Adriaan Walther, "Angle eikonals for a perfect zoom system," J. Opt. Soc. Am. A 18, 1968-1971 (2001)